This document discusses DNS (Domain Name System) servers and their functions. It explains that DNS allows users to type in domain names like "lifewire.com" and have their computer automatically find the corresponding IP address. It also describes two main types of DNS lookups - forward lookups that resolve domain names to IP addresses, and reverse lookups that resolve IP addresses back to domain names. The document provides details on how forward lookups work, with DNS servers able to forward requests to other servers if unable to locate the domain's IP address themselves. It also explains the process of reverse lookups using PTR records stored in the reverse DNS database rooted in the arpa top-level domain.

1. DNS SERVER

2. DNS
THE DOMAIN NAME SYSTEM (DNS)IS A TECHNOLOGY STANDARD
FOR MANAGING NAMES OF PUBLIC WEB SITES AND OTHER
INTERNET DOMAINS. DNSTECHNOLOGY ALLOWS YOU TO TYPE
NAMES INTO YOUR WEB BROWSER LIKE LIFEWIRE.COM AND
YOUR COMPUTER TO AUTOMATICALLY FIND THAT ADDRESS ON
THE INTERNET.AKEY ELEMENT OF THE DNSIS A WORLDWIDE
COLLECTION OF DNSSERVERS.

3. TYPES OF DNS LOOKUPS ZONE
FORWARDLOOKUPZONE
REVERSELOOKUPZONE.

4. FORWARD LOOKUPZONE-
ForwardDNSisatypeofDNSrequestinwhicha
domainnameisusedtoobtainitscorrespondingIP
address.ADNSserverissaidtoresolveadomain
namewhenitreturnsitsIPaddress.AforwardDNS
requestistheoppositeofareverseDNSlookup.
ForwardDNSisalsoknownasaforwardDNSlookup.
Ifunabletolocatethedomain'sIPaddress,theDNS
serverforwardstherequesttoanotherserver.

5. REVERSELOOKUPZONE
Incomputernetworks,areverseDNS
lookup orreverseDNSresolution(DNS) isthe
queryingoftheDomainNameSystem(DNS)to
determinethedomainnameassociatedwithanIP
address–thereverseoftheusual"forward"DNSlookup
ofanIPaddressfromadomainname.Theprocessof
reverseresolvinganIPaddressusesPTR records.The
reverseDNSdatabaseoftheInternetisrootedin
thearpatop-leveldomain.

6. ACTIVE DIRECTORY-
AserverrunningActive DirectoryDomainServices
(ADDS)iscalledadomaincontroller.
Itauthenticatesandauthorizesallusersand
computersinaWindowsdomaintypenetwork—
assigningandenforcingsecuritypoliciesforall
computersandinstallingorupdatingsoftware. Itis
includedinmostWindowsServeroperating
systemsasasetofprocessesandservices.[

7. How do I... Install and
configure a DNS server in
Windows Server 2008?

20. THANK YOU
Kajal sood
DESH BHAGAT UNIVERSITY